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Title: Amplitude modes in three-dimensional spin dimers away from quantum critical point

Abstract

Magnetic excitations of long-range ordered localized spin systems are generally well described by the linear spin-wave theory which accounts for phase fluctuations of the order parameter. In contrast, quasiparticles associated with amplitude fluctuations are only observed in a few quantum antiferromagnets close to a quantum critical point (QCP), where the ordered moment is suppressed significantly from its fully saturated value. Via inelastic neutron scattering measurements and extended spin-wave calculations, we present the observation and explanation of amplitude modes in the magnetic excitation spectra of three-dimensional S = 3/2 spin dimers Cr2TeO6 and Cr2WO6, which nevertheless are away from the QCP with the ordered moment reduced by only ~24%. We show that the large spin of Cr3+ and narrow bandwidth of the amplitude modes render their detection even in polycrystalline samples. This paper suggests that amplitude modes are not the privilege of ordered spin systems in the vicinity of a QCP, but may be common excitation modes that can survive even away from the QCP, paving a way to search for and understand the physics of amplitude fluctuations in antiferromagnets beyond the quantum spin limit (S=1/2).

Authors:
ORCiD logo; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); JSPS KAKENHI
OSTI Identifier:
1574550
Alternate Identifier(s):
OSTI ID: 1666022
Grant/Contract Number:  
AC05-00OR22725; 17K05516; DMR-1350002; DMR-1608752
Resource Type:
Published Article
Journal Name:
Physical Review Research
Additional Journal Information:
Journal Name: Physical Review Research Journal Volume: 1 Journal Issue: 3; Journal ID: ISSN 2643-1564
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
Magnetism; spin dynamics; magnetic systems; inelastic neutron scattering

Citation Formats

Zhu, M., Matsumoto, M., Stone, M. B., Dun, Z. L., Zhou, H. D., Hong, T., Zou, T., Mahanti, S. D., and Ke, X. Amplitude modes in three-dimensional spin dimers away from quantum critical point. United States: N. p., 2019. Web. doi:10.1103/PhysRevResearch.1.033111.
Zhu, M., Matsumoto, M., Stone, M. B., Dun, Z. L., Zhou, H. D., Hong, T., Zou, T., Mahanti, S. D., & Ke, X. Amplitude modes in three-dimensional spin dimers away from quantum critical point. United States. doi:10.1103/PhysRevResearch.1.033111.
Zhu, M., Matsumoto, M., Stone, M. B., Dun, Z. L., Zhou, H. D., Hong, T., Zou, T., Mahanti, S. D., and Ke, X. Tue . "Amplitude modes in three-dimensional spin dimers away from quantum critical point". United States. doi:10.1103/PhysRevResearch.1.033111.
@article{osti_1574550,
title = {Amplitude modes in three-dimensional spin dimers away from quantum critical point},
author = {Zhu, M. and Matsumoto, M. and Stone, M. B. and Dun, Z. L. and Zhou, H. D. and Hong, T. and Zou, T. and Mahanti, S. D. and Ke, X.},
abstractNote = {Magnetic excitations of long-range ordered localized spin systems are generally well described by the linear spin-wave theory which accounts for phase fluctuations of the order parameter. In contrast, quasiparticles associated with amplitude fluctuations are only observed in a few quantum antiferromagnets close to a quantum critical point (QCP), where the ordered moment is suppressed significantly from its fully saturated value. Via inelastic neutron scattering measurements and extended spin-wave calculations, we present the observation and explanation of amplitude modes in the magnetic excitation spectra of three-dimensional S = 3/2 spin dimers Cr2TeO6 and Cr2WO6, which nevertheless are away from the QCP with the ordered moment reduced by only ~24%. We show that the large spin of Cr3+ and narrow bandwidth of the amplitude modes render their detection even in polycrystalline samples. This paper suggests that amplitude modes are not the privilege of ordered spin systems in the vicinity of a QCP, but may be common excitation modes that can survive even away from the QCP, paving a way to search for and understand the physics of amplitude fluctuations in antiferromagnets beyond the quantum spin limit (S=1/2).},
doi = {10.1103/PhysRevResearch.1.033111},
journal = {Physical Review Research},
number = 3,
volume = 1,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1103/PhysRevResearch.1.033111

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